US11161972B2ActiveUtilityA1

Ethylene-vinyl alcohol copolymer composition, melt-forming material, multilayer structure, and container thermoforming material

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Assignee: MITSUBISHI CHEM CORPPriority: Nov 22, 2017Filed: Mar 19, 2020Granted: Nov 2, 2021
Est. expiryNov 22, 2037(~11.4 yrs left)· nominal 20-yr term from priority
Inventors:Shintaro UsuiMinako Ikeshita
B32B 2250/03B32B 27/306C08L 2203/30B32B 2307/738B32B 2250/02C08L 2205/025B32B 2307/73B32B 25/08B32B 27/325C08L 29/06B32B 2439/00B32B 7/12B32B 27/302B32B 2439/80B32B 2439/70B32B 27/22B32B 25/14B32B 27/18B32B 27/308B32B 25/042B32B 27/32B32B 27/304B32B 2270/00B32B 2250/05B32B 27/20B32B 2307/40C08L 29/04B65D 65/40B32B 27/34B32B 27/08B32B 27/36B32B 27/288
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Cited by
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References
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Claims

Abstract

A thermoformable ethylene-vinyl alcohol copolymer composition contains: (A) an ethylene-vinyl alcohol copolymer comprising two or more ethylene-vinyl alcohol copolymers having different ethylene structural unit contents; and (B) a sorbic acid ester; wherein the sorbic acid ester (B) is present in an amount of 0.00001 to 10 ppm based on the weight of the ethylene-vinyl alcohol copolymer composition. The ethylene-vinyl alcohol copolymer composition is excellent in coloration-suppressing effect.

Claims

exact text as granted — not AI-modified
The invention claimed is: 
     
       1. An ethylene-vinyl alcohol copolymer composition comprising:
 (A) an ethylene-vinyl alcohol copolymer comprising two or more ethylene-vinyl alcohol copolymers having different ethylene structural unit contents; and 
 (B) at least one sorbic acid ester selected from the group consisting of methyl sorbate and ethyl sorbate; 
 wherein the at least one sorbic acid ester (B) is present in an amount of 0.00001 to 10 ppm based on a weight of the ethylene-vinyl alcohol copolymer composition. 
 
     
     
       2. The ethylene-vinyl alcohol copolymer composition according to  claim 1 , wherein a difference in ethylene structural unit content between:
 an ethylene-vinyl alcohol copolymer having a highest ethylene structural unit content, and 
 an ethylene-vinyl alcohol copolymer having a lowest ethylene structural unit content in the ethylene-vinyl alcohol copolymer (A) is not less than 2 mol %. 
 
     
     
       3. The ethylene-vinyl alcohol copolymer composition according to  claim 1 , wherein the ethylene-vinyl alcohol copolymer (A) comprises:
 (A1) an ethylene-vinyl alcohol copolymer having an ethylene structural unit content of less than 35 mol %; and 
 (A2) an ethylene-vinyl alcohol copolymer having an ethylene structural unit content of not less than 35 mol %. 
 
     
     
       4. The ethylene-vinyl alcohol copolymer composition according to  claim 3 , wherein the ethylene-vinyl alcohol copolymer (A1) having an ethylene structural unit content of less than 35 mol % and the ethylene-vinyl alcohol copolymer (A2) having an ethylene structural unit content of not less than 35 mol % are present in a weight ratio (A1)/(A2) of 1/99 to 99/1. 
     
     
       5. A melt-forming material comprising the ethylene-vinyl alcohol copolymer composition according to  claim 1 . 
     
     
       6. A multilayer structure comprising a layer that comprises the ethylene-vinyl alcohol copolymer composition according to  claim 1 . 
     
     
       7. A container thermoforming material comprising the multilayer structure according to  claim 6 .

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